NMR Study of the Mott Transitions to Superconductivity in the Two Cs3C60 Phases

Y. Ihara; H. Alloul; P. Wzietek; D. Pontiroli; M. Mazzani; M. Riccò

doi:10.1103/PhysRevLett.104.256402

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NMR Study of the Mott Transitions to Superconductivity in the Two Cs3C60 Phases

Y. Ihara, H. Alloul, P. Wzietek, D. Pontiroli, M. Mazzani, M. Riccò

DOI 10.1103/PhysRevLett.104.256402 · Physical Review Letters

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Abstract

We report a NMR and magnetometry study on the expanded intercalated fulleride Cs3C60 in both its A15 and face centered cubic structures. NMR allowed us to evidence that both exhibit a first-order Mott transition to a superconducting state, occurring at distinct critical pressures pc and temperatures Tc. Though the ground state magnetism of the Mott phases differs, their high T paramagnetic and superconducting properties are found similar, and the phase diagrams versus unit volume per C60 are superimposed. Thus, as expected for a strongly correlated system, the interball distance is the relevant parameter driving the electronic behavior and quantum transitions of these systems.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Cs3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown